Aug 18, 2013 · The correct answer is "python collections do not have a foreach". In native python we need to resort to the external for _element_ in _collection_ syntax which is not what the OP is after. Python is in general quite weak for functionals programming. There are a few libraries to mitigate a bit. I helped author one of these infixpy

Oct 31, 2016 · The foreach construct is unfortunately not intrinsic to collections but instead external to them. The result is two-fold: it can not be chained; it requires two lines in idiomatic python. Python does not support a true foreach on collections directly. An example would be. myList.foreach( a => print(a)).map( lambda x: x*2) # python can't do this..

Notice that the index runs from 0. This kind of indexing is common among modern programming languages including Python and C. If you want your loop to span a part of the list, you can use the standard Python syntax for a part of the list. For example, to loop from the second item in a list up to but not including the last item, you could use

To add on to chepner's answer for Python 3.0 you can alternatively do: x = lambda x: list(map(print, x)) Of course this is only if you have the means of using Python > 3 in the future... Looks a bit cleaner in my opinion, but it also has a weird return value, but you're probably discarding it anyway. I'll just leave this here for reference.

Sep 15, 2011 · When a for-loop executes, it takes the name you give it, and binds it in turn to each object in the iterable while running the loop; when you call a function, it takes the names in the function header and binds them to the arguments passed; reassigning a name is actually rebinding a name (it can take a while to absorb this -- it did for me ...

@KirillTitov Yes python is a fundamentally non-functional language (this is a purely imperative coding - and I agree with this answer's author that it is the way python is set up to be written. Attempting to use functionals leads to poorly reading or non-pythonic results. I can code functionally in every other language I use (scala, kotlin ...

The foreach loop, added in Java 5 (also called the "enhanced for loop"), is equivalent to using a java.util.Iterator – Alex78191 Commented Nov 21, 2019 at 19:10

Jun 25, 2015 · I tried replacing the for loop with: [p.append(q.index(v)) if v in q else p.append(99999) for v in vm] But it doesn't work. The for v in vm: loop evicts numbers from vm based on when they come next in q.

In other languages you can label the loop and break from the labelled loop. Python Enhancement Proposal (PEP) 3136 suggested adding these to Python but Guido rejected it: However, I'm rejecting it on the basis that code so complicated to require this feature is very rare.

Jun 26, 2019 · You imply that foreach loops don't exist in python, when, in fact, all for loops are foreach loops in python. The syntax is for var in iterable:, where iterable must be some object that can be iterated through (to iterate through the values 0 through 9, you use the range(10) function instead of the C-style for (i=0; i < 10; i++))